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Nitrile Oxides, Nitrones, and Nitronates in Organic Synthesis : Novel ...

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PRINCIPAL PHYSICOCHEMICAL DATA AND CHARACTERISTICS 503<br />

Table 3.11 13 C NMR resonances for nitronates a<br />

δ(C − α)<br />

Entry Nitronate ppm Notes Ref.<br />

1 MeCH = N(O)OSiMe3 109.8 1J( 13C, 15 2<br />

OBEt2O<br />

134.9<br />

N) = 27.4 Hz 277<br />

CH3CH N N CHCH3<br />

OBEt2O<br />

1J( 13C, 15N) = 27.5 Hz 272<br />

3 MeCH = N(O)OBEt2·NC5H5 (−30 ◦ C) 114.3 1J( 13C, 15N) = 27.0 Hz 272<br />

4 Me2C = N(O)OSiMe3 118.3 277<br />

5 (MeO2C)2C = N(O)OSiMe3 114.2 δCO 158.8 ppm 277,278<br />

6<br />

(MeO2C) 2C<br />

O<br />

N<br />

O<br />

111.7 δCO 158.1 <strong>and</strong><br />

170.1 ppm<br />

272<br />

BEt 2<br />

7 (MeO2C)2C = N(O)OMe 111.8 δCO 158.5 <strong>and</strong><br />

159.5 ppm<br />

8 MeOCOC(Me)2CH = N(O)OSiMe3 120.2 δCO 172.5 ppm 272<br />

9 [MeOCOC(Me)2CH = N(O)OBEt2]2 139.9 δCO 172.9 ppm 272<br />

10 MeOCOC(Me)2CH = N(O)OBEt2·NC5H5 121.9 δCO 174 ppm 272<br />

11 CH N(O)O<br />

105.8 δCO 168.9 ppm 272<br />

CONH2<br />

BEt2<br />

12<br />

Me CO2Et 112.4 270<br />

13<br />

14<br />

15<br />

O N<br />

EtO2C Ph<br />

O<br />

H<br />

MeO<br />

Me<br />

O N<br />

O<br />

C6H4-p-(OMe)<br />

Me<br />

O N<br />

Ph<br />

O N<br />

O<br />

Me<br />

O<br />

266<br />

113.4 274<br />

123 267<br />

121.9 274<br />

aFor MeCH2NO2: δCH2NO2 = 69.3 ppm; for [MeCH(NO2)] − δα − C = 115.7 ppm; 266<br />

for (MeO2C)2CHNO2: δCHNO2 = 88.2 ppm; for [(MeO2C)2CNO2] − δα − C = 111.7 ppm 266;<br />

for PhCH=NOH: δα − C = 146.4 (syn), 149.6 (anti) ppm; for Me2C=NOH: δα − C = 154.3 ppm 279

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